I have a custom small and large picture for my Y-TIE
and a small picture for my Vorkoff-Strood Titan 2150. (nice, aint they)
I, unfortunately do not know how to add these to my ship or my vehicle. The person who made the images (Stall Kalar) said something about CPs, which I have 190 of. Can someone explain to me how to add them to the ship/vehicle.

You can't, you need 500 CPs per entity you apply custom images to. When you do get 1,000 CPs, however, you click on the CP number that you have, (under your character picture) then click exhange CPs. Scroll down then you see custom images. (Nice pics btw.)